Invoking Application in Shell Script

Shell Programming and Scripting
1

Hi All,

I have a scenario :

  1. A list of servers naming server21, server 22, server 23 etc. This list of servers is separate for my environments.

Env1 has 3 server
Env2 has 5 serves
Env3 has 10 servers

  1. Each server accesses application through which I want to invoke some method. So the URL for Env1 and Server21 in it would be : http://Server21/abc.click.clear etc.

Now I want to make a shell script which invokes all these methods by Env wise and then server wise. I know wget will do the invoking but I am unable to make out the structure of the script. Can someone help me put on this?

2

If I understand correctly, you want to run a wget on a specific url on each server, and each server is in one of three environments?

If the app is always the same then it's just a matter of a 'for' loop:

for environment in `cat ListofEnvironments.txt`
do
  echo "Environment: ${environment}"
  for server in `cat ListOfServersIn${environment}.txt`
  do
    echo "  Server: ${server}"
    wget -q -O "${server}_abc.click.clear-output.txt" "http://${server}/abc.click.clear"
  done
done

Not tested, you might need some slight debug.

If you want to run in parrallel instead (faster but everything runs at once), just add a n ampersand ('&') to the end of the wget line.

3

The servers have different names for each environments and the environment names are also different.

4

Give us an example and we should be able to help more.

5

Environment 1 name : DEV

Server name : aedcmap021, aedcmap022

Environment 2 name: Test

Server name : aetcmap002, aetcmap030

Env 3 name : QA

aeqcmap021, aeqcmap023

6

If you make a file for each enviroment, naming it as such,
containing each its servers (without the leading 'http://') it'll be like:

# untested
cd /path/to/list/files
for ENV in $(ls);do
    echo "Working with $ENV"
    while read SERVER;do
        echo " * $SERVER"
        wget -q -O "${SERVER}_abc.click.clear-output.txt" "http://${SERVER}/abc.click.clear"
    done < $ENV
done

Hope this helps

7

Thanks SEA for the code.

I did the same way but called my files outside the for loop. Yeah the basic approach remains same. Have a look if you want to.

I love Scripting.

Thanks all PROBLEM Solved

8

Thanks, but its not much diffrent from Smiling Dragon.

Now with all the 'data', i'd make it like:

#!/bin/sh

TASKS=""
cd /path/to/files

usage() 
{ 
cat << EOF 
usage: $(basename $0) \[all|dev|test|qa|dr|pp|prod\] 
 
Check Startup Status 
 
OPTIONS: 
   -h      Show this message 
EOF 
}


for ENV in $@;do
    if [[ -f $ENV ]]
    then    echo "Adding $ENV to worklist"
            TASKS+=" $ENV"
    elif [[ all = "$ARG ]]
    then    echo "Do all"
            TASKS="$(ls)"
    else    echo "Error?"
            usage    # Call the 'help function'
            exit 1
        fi
done

for ENV in $TASKS;do
    echo "Working with $ENV"
    while read SERVER;do
        echo " * $SERVER"
        for folderName in HomePageCache PLPContentCache NoResultPageCache;do
            SUBPATH="/dyn/admin/nucleus/com/newlook/droplet/$folderName/?invokeMethod=flushCache&submit=Invoke+Method"
            url="http://${SERVER}${SUBPATH}"
            rm -r $folderName # Removing data befor downloading
            wget -P $folderName --timeout=5 --tries=3 --http-user=admin --http-password=admin "$url"
        done
    done < $ENV
done